package com.sky.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.sky.dto.GoodsSalesDTO;
import com.sky.entity.Orders;
import com.sky.mapper.OrderMapper;
import com.sky.mapper.UserMapper;
import com.sky.service.OrderService;
import com.sky.service.ReportService;
import com.sky.service.WorkspaceService;
import com.sky.vo.*;
import org.apache.commons.lang.StringUtils;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;


import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.InputStream;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

@Service
public class ReportServiceImpl implements ReportService {
    @Autowired
    private OrderMapper orderMapper;
    @Autowired
    private UserMapper userMapper;
    @Autowired
    private WorkspaceService workspaceService;
    @Override
    public TurnoverReportVO getTurnoverStatistics(LocalDate begin, LocalDate end) {
        //当前集合用于存放begin到end范围内每天的日期
        List<LocalDate> dateList = new ArrayList<>();

        dateList.add(begin);
        while(!begin.equals(end)){
            //日期计算,计算指定日期后一天对应的日期
            begin = begin.plusDays(1);
            dateList.add(begin);
        }
        //存放每天营业额
        List<Double> turnOverList = new ArrayList<>();
        for(LocalDate date:dateList){
            //获取这一天开始时间,结束时间
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);

            Map map = new HashMap<>();
            map.put("begin",beginTime);
            map.put("end",endTime);
            map.put("status",Orders.COMPLETED);
            //查询当天所有已完成的订单的总金额
            Double turnover = orderMapper.sumByMap(map);
            turnover= turnover == null ? 0.0 : turnover;
            turnOverList.add(turnover);
            }

        return TurnoverReportVO
                .builder()
                .dateList(StringUtils.join(dateList,","))
                .turnoverList(StringUtils.join(turnOverList,","))
                .build();
    }

    @Override
    public UserReportVO getUserStatistics(LocalDate begin, LocalDate end) {
        //当前集合用于存放begin到end范围内每天的日期
        List<LocalDate> dateList = new ArrayList<>();

        dateList.add(begin);
        while(!begin.equals(end)){
            //日期计算,计算指定日期后一天对应的日期
            begin = begin.plusDays(1);
            dateList.add(begin);
        }

        //存放每天新增用户总量
        List<Integer> newUserList = new ArrayList<>();
        //存放每天总的用户量
        List<Integer> totalUserList = new ArrayList<>();

        for(LocalDate date:dateList){
            //获取这一天开始时间,结束时间
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);

            Map map = new HashMap<>();
            map.put("end",endTime);
            //总用户数量
            Integer totalUser = userMapper.countByMap(map);
            map.put("begin",beginTime);
            //新增用户数量
            Integer newUser = userMapper.countByMap(map);

            totalUserList.add(totalUser);
            newUserList.add(newUser);
        }
        return UserReportVO.builder()
                .dateList(StringUtils.join(dateList,","))
                .totalUserList(StringUtils.join(totalUserList,","))
                .newUserList(StringUtils.join(newUserList,","))
                .build();
    }

    @Override
    public OrderReportVO getOrderStatistics(LocalDate begin, LocalDate end) {

        //当前集合用于存放begin到end范围内每天的日期
        List<LocalDate> dateList = new ArrayList<>();

        dateList.add(begin);
        while(!begin.equals(end)){
            //日期计算,计算指定日期后一天对应的日期
            begin = begin.plusDays(1);
            dateList.add(begin);
        }
        //存放每天订单总数
        List<Integer> orderCountList = new ArrayList<>();
        //存放每天有效订单总数
        List<Integer> validCountList = new ArrayList<>();

        for(LocalDate date:dateList){
            //获取这一天开始时间,结束时间
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);

            //查询每天订单总数
            Integer orderCount = getOrderCount(beginTime, endTime, null);
            //查询每天有效订单总数
            Integer validCount = getOrderCount(beginTime, endTime, Orders.COMPLETED);

            orderCountList.add(orderCount);
            validCountList.add(validCount);
        }

        //计算该时间区间内订单总数
        Integer totalOrderCount = orderCountList.stream().reduce(Integer::sum).get();
        //计算该时间区间内有效订单总数
        Integer validOrderCount = validCountList.stream().reduce(Integer::sum).get();

        Double orderCompletionRate = 0.0;
        if(totalOrderCount !=0){
            //计算订单完成率
            orderCompletionRate = validOrderCount.doubleValue() / totalOrderCount;
        }
        return OrderReportVO.builder()
                .dateList(StringUtils.join(dateList,","))
                .orderCountList(StringUtils.join(orderCountList,","))
                .validOrderCountList(StringUtils.join(validCountList,","))
                .totalOrderCount(totalOrderCount)
                .validOrderCount(validOrderCount)
                .orderCompletionRate(orderCompletionRate)
                .build();
    }

    @Override
    public SalesTop10ReportVO getSalesTop10(LocalDate begin, LocalDate end) {
        //获取这一天开始时间,结束时间
        LocalDateTime beginTime = LocalDateTime.of(begin, LocalTime.MIN);
        LocalDateTime endTime = LocalDateTime.of(end, LocalTime.MAX);

        List<GoodsSalesDTO> salesTop10 = orderMapper.getSalesTop10(beginTime, endTime);
        List<String> nameList = salesTop10.stream().map(GoodsSalesDTO::getName).collect(Collectors.toList());
        String names = StringUtils.join(nameList, ",");

        List<Integer> numberList = salesTop10.stream().map(GoodsSalesDTO::getNumber).collect(Collectors.toList());
        String numbers = StringUtils.join(numberList, ",");

        return SalesTop10ReportVO.builder()
                .nameList(names)
                .numberList(numbers)
                .build();
    }

    @Override
    public void exportBusinessData(HttpServletResponse response) {
        //1.查询数据库,获取营业数据--查询近30天营业数据
        LocalDate dateBegin = LocalDate.now().minusDays(30);
        LocalDate dateEnd = LocalDate.now().minusDays(1);
        //查询概览数据
        BusinessDataVO businessData = workspaceService.getBusinessData(LocalDateTime.of(dateBegin, LocalTime.MIN), LocalDateTime.of(dateEnd, LocalTime.MAX));
        //2.通过POI将数据写入excel文件
        InputStream in = this.getClass().getClassLoader().getResourceAsStream("template/运营数据报表模板.xlsx");

        try {
            //基于模板文件创建一个新的Excel文件
            XSSFWorkbook excel = new XSSFWorkbook(in);

            //获取表格文件的sheet页
            XSSFSheet sheet = excel.getSheet("sheet1");

            //填充数据-时间
            sheet.getRow(1).getCell(1).setCellValue("时间:"+dateBegin+"至"+dateEnd);

            //获得第四行
            XSSFRow row = sheet.getRow(3);
            row.getCell(2).setCellValue(businessData.getTurnover());
            row.getCell(4).setCellValue(businessData.getOrderCompletionRate());
            row.getCell(6).setCellValue(businessData.getNewUsers());

            //获得第5行
            row = sheet.getRow(4);
            row.getCell(2).setCellValue(businessData.getValidOrderCount());
            row.getCell(4).setCellValue(businessData.getUnitPrice());

            //填充明细数据
            for(int i = 0;i<30;i++){
                LocalDate date = dateBegin.plusDays(i);
                //查询某一天的营业数据
                BusinessDataVO businessDataVO = workspaceService.getBusinessData(LocalDateTime.of(date, LocalTime.MIN), LocalDateTime.of(date, LocalTime.MAX));
                //获得某一行
                row = sheet.getRow(7+i);
                row.getCell(1).setCellValue(date.toString());
                row.getCell(2).setCellValue(businessDataVO.getTurnover());
                row.getCell(3).setCellValue(businessDataVO.getValidOrderCount());
                row.getCell(4).setCellValue(businessDataVO.getOrderCompletionRate());
                row.getCell(5).setCellValue(businessDataVO.getUnitPrice());
                row.getCell(6).setCellValue(businessDataVO.getNewUsers());
            }


            //3.通过输出流将excel文件下载到客户端浏览器
            ServletOutputStream outputStream = response.getOutputStream();
            excel.write(outputStream);

            //关闭资源
            outputStream.close();
            excel.close();
        } catch (IOException e) {
            throw new RuntimeException(e);
        }

    }

    /*
    * 根据条件统计订单数量
    * */
    private Integer getOrderCount(LocalDateTime begin,LocalDateTime end,Integer status){
        Map map = new HashMap();
        map.put("begin",begin);
        map.put("end",end);
        map.put("status",status);
        return orderMapper.countByMap(map);
    }

}
